[sdiy] There is no fun analogue chips anymore!

[Andrew Simper]

On 27 June 2012 08:25, Veronica Merryfield <veronica at merryfield.ca> wrote:
>
> Whilst the 741 is not a CA3080 replacement, has anyone tried using the two offset null pins (1 and 5) for gain control? I would think a common collector to the two pins might have some effect although the transfer function might be a little odd. Just a thought.
>

Those thrifty Russians not only used the "Iset" (pin8) for to control
the cutoff but also the inbuilt capacitor of the uA776 as the
integrator to make a state variable resonant filter!

http://m.bareille.free.fr/modular1/vcf_polivoks/vcf_polivoks.htm

Andy
--
cytomic - sound music software